This document is part of a toolkit written for and by HIV trainers. The toolkit has been designed to help trainers plan and organise educational sessions with community leaders or organised groups. It consists in a collection of participatory training exercices to help people at all levels understand stigma - what it means, why it is an important issue, what its root causes are - and develop strategies to challenge stigma and discrimination.The present document contains the introduction to the toolkit and the Module A, "Naming the problem". …